x^2-8*x-12=0

Simple and best practice solution for x^2-8*x-12=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for x^2-8*x-12=0 equation:


Simplifying
x2 + -8x + -12 = 0

Reorder the terms:
-12 + -8x + x2 = 0

Solving
-12 + -8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -8x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -8x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -8x + x2 = 0 + 12
-8x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-8x + x2 = 12

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 12 + 16

Reorder the terms:
16 + -8x + x2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + -8x + x2 = 28

Factor a perfect square on the left side:
(x + -4)(x + -4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(x + -4) equal to 5.291502622 and -5.291502622.

Subproblem 1

x + -4 = 5.291502622 Simplifying x + -4 = 5.291502622 Reorder the terms: -4 + x = 5.291502622 Solving -4 + x = 5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + x = 5.291502622 + 4 x = 5.291502622 + 4 Combine like terms: 5.291502622 + 4 = 9.291502622 x = 9.291502622 Simplifying x = 9.291502622

Subproblem 2

x + -4 = -5.291502622 Simplifying x + -4 = -5.291502622 Reorder the terms: -4 + x = -5.291502622 Solving -4 + x = -5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + x = -5.291502622 + 4 x = -5.291502622 + 4 Combine like terms: -5.291502622 + 4 = -1.291502622 x = -1.291502622 Simplifying x = -1.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.291502622, -1.291502622}

See similar equations:

| 5(d+4)=2(2d-1) | | 3(2s+1)=5(s+2) | | 3(v+2)=2(v+5) | | 4(k+3)=3(k-2) | | 169=-13(x-7) | | 22x+7c=17x-95 | | 84+48+6e=180 | | 3(2w+1)=3w-15 | | 3(a-5)=5-2a | | 4(e-2)=2e+4 | | 5(p-2)=3p | | 3(p+3)=2p+3 | | 2(r+2)=r+5 | | 6(x+1)=3x+3 | | 24=2(m-3) | | r^2+16= | | 5x+45=10x | | 7a(-2b)c= | | 35=6+2a | | (8x^2)+8x+10=0 | | 7x=(x+4+35).5 | | 75+40h=35+40h | | (4x)=-32 | | 4+x=4-x | | (4x)=32 | | -12.4=4(k-9) | | z=3x-4yforx | | y+2y=4 | | (3y+9y)=27 | | 4(6-c)=-16 | | -2(3-k)=12 | | 5(d+3)=-20 |

Equations solver categories